import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class Demo7 {

    public static void main(String[] args) throws ExecutionException, InterruptedException {

        Callable<Integer> callable = new Callable<Integer>() {
            @Override
            public Integer call() throws Exception {
                int sum = 0;
                for (int i=1;i< 100;i++) {
                    sum += i;
                }
                return sum;
            }
        };
        FutureTask<Integer>futureTask=new FutureTask<>(callable);
        Thread t=new Thread(futureTask);
        t.start();
        Integer result= futureTask.get();
        System.out.println(result);
    }
}